Grinding machine



May 10,1932. H. A. slm/EN 1,858,222

GRINDING' MACHINE Filed Dec. 31, 192,8 3 Sheets-sheet 1 m hm. w ./4/ 5 f hu. T w I0 s.. W .J fm Q f/ KIM g WM- We.' M N! Nm, On w. I. m .vv rm. g

May 10, 1932.

H. A. SILVEN GRINDING MACHINE l Filed Dec. 31. 1928 3 Sheets-Sheet 2 May l0, 1932,.. H. A. slLvEN' 1,858,222

' GRINDING MACHINE .Filed Dc. s1, .192:3 s sheets-sheet 3f Patented May? 10, 1932 UNITED gSTATES PATENT GFFICE HERBERT A. SILVEN, 0F WORCESTER, MASSACHUSETTS, ASSIGNOR T0 NORTON COM- PANY, 0F WORCESTER, MASSACHUSETTS, A CORPORATION 0F MASSACHUSETTS GRINDING MACHINE Application led December 3l, 1928. Serial No. 329,488.

This invention relates to grinding Inachines and more particularly' to a Work steadying, gauging and Wheel feed control ling mechanism in a grinding machine.

-The grinding machines of standard construction have numerous controls arranged to operate the work st eadying rest and the Work gauging device and to control the 1vheel feeding and travers'ng mechanism.

no This has required the operator to utilize considerable ingenuity in manipulating the controlling members in their proper .sequence to insure proper operation of the machine. lin the grinding of a crankshaft or the like, it is essential that the Work supporting table be stationary during the grinding period so as to avoid injury to the grinding wheel and work. and that no attempt be made to traverse the table before the grinding Wheel has been removed to a considerable distance from the axis of the crankshaft, because the Wheel is located, during the grinding operation, hetween the crank arms which carry the. pin heing ground. in operating such a machine, it is necessary for the operator to grind the pin partially and then after manipulating the steadyrest controls, remove the steadyrest shoes from operative engagement with the Work; thereafter he swings the grinding gauge into operative position to gauge or measure the diameter of the pin being ground. Considerable delay in the finish grinding of the crankpin results from the necessity to measure the Work and reposition the steadyrest shoes frequently in order to grind the pm to the exact size required.

Moreover, in such grinding machines, it has heretofore been necessary for the operator to lift the piece of Work, such as a heavy crankshaft, over the table and the steadyrest mechanisminordertogetitintopositiononthe Work supporting head. rThis operation involves a waste of time and energy on the part of the operator. ln running the machine, the operator has had not only to. manipulate the steadyrest and other machine controls but also to manually operate the valve controlling the supply of coolant fluid. Before he could measure the work, he had to shut oii' the coolant fluid and then bring the gauge into operative Contact with the work. If the Work is found to be oversize and it is necessary to grind it further, the operator must again manipulate the valve to turn on the coolant duid. This meant an additional control for the operator to worry about in grinding the crankpin or other similar article.

it is accordingly one object of this invention to provide a grinding machine with a steadyrest which may be readily moved bodily into and out of operating position, so that the operator has unobstructed access to the workholders and may placethe work piece in operating position without undue muscular exertion.

it is another object to provide a lever control for the steadyrest which will simultaneously move the steadyrest shoe and the gauging device into operative engagement with the work.

llt is still a further object to provide a manual control orf moving the steadyrest shoe and the gauging device into or out of operative contact with the work when moved in one direction which is connected to stop or reverse the grinding wheel feed mechanism when moved in a second direction.

It is another object of this invention .to provide an interlocking device for the table traverse mechanism to lock and prevent longitudinal movement of the Work table during the grinding operation.

lit is still another object of this invention to provide a; lever operated mechanism to simultaneously clamp the steadyrest rigidly on the work table and to move the steadyrest shoe into position adjacent the surface of the piece of Work to be ground.`

lt is a further object of this invention to provide a valve mechanism which is connected with the movable mount xfor the steadyrest so that the movement of the steadyrest into or out of an operating position Will automatically open or close the coolant fluid control valve. Y

With these and other objects as will be ap- .may be moved bodily Referring to the drawings which illustrate one embodiment of the invention and in which like reference numerals indicate like parts:

' Fig. 1 is a fragmentary end view of a grinding machine showing the steadyrest and the gauging device mounted on a movable support which is connected to the coolant fluid valve, the steadyrest being shown in an inoperative position in full lines and also in an operating position in broken lines;

Fig. 2 is a side elevation on an enlarged scale, partly broken away and in section, showing the steadyrest and the gauging device on the work table and connections with the steadyrest for interlocking with the traverse mechanism and for operating the control valve;

Fig. 3 is a front elevation on an enlarged scale of the steadyrest in an operating position showing diagrammatically the connections between the steadyrest and the traverse control valve which interlocks to prevent traverse of the table during grinding, and showing the connections between the steadyrest control and the valve controlling the wheel feeding mechanism;

Fig. 4 is a fragmentary view showing the mechanism for controlling the movement of the work steadying shoes;

Fig. 5 is a fragmentary view showing the relative position of the steadyrest shoes to the wcrl'k when the steadyrest is unlocked on the ta e;

Fig. 6 is a fragmentary plan view taken along the line'-G of Fig. 2 showing the relative position o f the steadyrest shoes and the gauge to the work piece; and

Fig. 7 is a view of the `steadyrest control lever and its associated parts.

One type of grinding machine embodying the various features `of this invention has a work table slidable longitudinally of the base and a wheel slide adapted for transverse movement to feed the grindin wheel into the work. A steadyrest is emp oyed for supporting and steadying the work during grinding and a device is used to measure the work. They may be so arranged that they may be readily moved to and from an operating position and so give the operator'unobstructed access to the work supporting heads and not require him to lift a heavy piece of work over the table and the steadyrest to insert it in the work supporting head. This is accomplished by mounting the steadyrest and the gauge on a movable support, andpreferably on a swinging arm, so arranged that the away from the wor without undue exertion on the part of the operator. A fiuid system is employed to cool the work during grinding, and a valve therein may be automaticall controlled by the movement of the stea yrest or the work gauging device so that when the rest or gauge is brought to and from an operative position on the table and thc' coolant fluid is automatically turned on or off. This is preferably accomplished by means of a releasable connection betwen the valve and the support for the steadyrest.

The grinding machine includes a table traversing mechanism, and preferably a fiuid operated system, which ismanually controlled to position successive portions of the work, such as crankpins, in proper relation with the grinding wheel. The valve controlling the fluid motor may be inter-connected with the steadyrest or the work gauge moving mechanism so that the table traversing mechanism may be locked in a neutral position during the grinding operation. This may be accomplished by means of a contact member mounted to be -moved into the path of the control valve when the steadyrest is swung into its operative position. The steadyrest may be moved by a handle which serves both to pull the restinto position and to clamp it in place7 and this handle may also be movable to bring the shoes into position adjacent to the surface ofthe work. The steadyrest may also be provided with a controlling mechanism including a lever which is movable in one direction to simultaneously move the work steadying shoes and a gauging device into operative engagement with the work, and in a second direction to either stop the wheel feed and permit the grinding wheel to spark out or finish grind the work or to throw the wheel feeding mechanism into reverse and rapidly remove the grinding whell from operative engagement with the wor drawings comprises a base 11 carrying the work supporting table 12 slidably mounted on the usual V-way 13 and flat way (not shown) to permit the work to be traversed longitudinally of the base. A wheel slide 14 is mounted on the usual ways on the base 11 to feed the rotatable grinding wheel 15 toward and from the work to reduce it to the required size. The grinding wheel 15 is surrounded by a wheel guard 16 which may be suitably mounted on themachine, such as by means of a bracket 17 which is an integral part of the wheel slide.

Steady/rest A steadyrest is provided to support and steady the work, and it is adapted to be clamped rigidly on the work supporting table during the grinding operation.

To attain one vof the objects of this invention, the steadyrest is arranged so that .it may be moved to an inoperative position to The grinding machine illustrated in the l permit unobstructed access to the work holding members and again readily returned to an operative position in engagement with the work table and the work piece after the end of the arm 21 is connected to a short arm 23 by a pivot pin 24. The lower end of the arm 23 is loosely mounted on a stud 26 which projects from the side face of the steadyrest 20. This permits the steadyrest to be swung from an inoperative position, as shown in full lines in Fig. 1, into an operative position on the work table 12 as shown in broken lines in Fig. 1. rlhe swinging arm 21 is preferably provided with a counter balance so that the operator may swing the rest without undue exertion. rl`his mechanism may comprise a spring fastened at one end by means of an eye bolt 31 to the bracket 32 which is supported on the 'rear end of the wheel slide 14. The other end ot the spring 30 is connected to one end of a link chain 33 which rides in a groove in the periphery of the cam plate 34 and is fixed at its other end to a. pin 35 on the cam plate.

ln order that the steadyrestA supporting Y arm 23 and 21 may be maintained in their proper relation to support the steadyrest in each position without permitting an undue amount of swinging movement, a rod 36 is connected at one end to a stud 37 which is loosely mounted on the arm 21 and passes through a pivotally mounted stud 38 on the arm 23. A pair of opposed springs are provided to maintain the steadyrest supporting arm 23 in proper relation with the arm 21. rihese comprise a spring 39 interposed between the pins 37 and 38 and a spring 4() interposed between the pin 38 and the nuts on the end of the rod 36.

The steadyrest 20 is provided with a handle 41 which is pivotally mounted on a. stud on the frame of the rest 20 and serves as a grip to permit the operator to swing the steadyrest. 'lhis lever also serves to operate the clamping mechanism to securely lock the steadyrest to the supporting ysurface on the table 12. The lower face of the rest 20 is provided with a lug 43 having a V-shaped surface which engages a correspondingly shaped surface on the table 12. A clamping member 44 is pivotally mounted on' a stud 45 on the steadyrest and is adapted to engage the table and securely lock the steadyrest thereto.

VThe upper end of the clamping member 44 is provided with a screw 46 whichis pivotally connected to the link 47. The short arm 48 of the bell crank is pivotally connected to the link 47. `When the operator rocks the handle 41 upwardly from the position shown in Fig. 2 into the position shown in full lines in Fig. 1 the arm 48 swings downwardly. thereby carrying the link 47 which in turn swings the clamping member 44 aboutits pivot. and therebyunlocks the steadyrest from the table 12. When the handle has been swung upwardly suicient to unlock the steadyrest from the table, further upward pressure on the handle moves the whole stea-dyrest bodily into an inoperative position. as shown in full lines in Fig. 1.

Suitable work steadying shoes 50 and 51 are provided to engage the surface of the work and prevent vibration thereof during the grinding operation. The horizontally ad- 'ustab-le shoe 50 is bolted and keyed to a memer by a screw 53. rlhe member 52 is slidably mounted inthe aperture 54 in the rest 20. The vertically adjustable shoe 51 is bolted to the end of la lever 56 which is pro-v vided with a pivot pin 57 fitting within an elongatedslot 58 in the frame of the steadyrest 20. It will be readily seen from this construction that any rocking movement. of the lever 56 about the pivot 57 will move the work supporting shoe 51 toward or from the axis of the work. ln al steadyrest of this type, it is desirable that the shoes 50 and 51 be adjustable simultaneously so that their movement may be more readily controlled. rthis is accomplished by mounting a bell crank lever .60 on the stud 42. The arm 62 of the bell crank lever 60 is provided with a gear segment 61 which meshes with a gear segment 63 on the end of the lever 56. The other arm of the bell crank levert() is provided with a gear segment 64 which meshes Avvit-h rack teeth 65 o'n a sleeve 66. rl`he sleeve 66 is slidably mounted within the opening 67 in the steadyrest 20. An adjusting screw 70 is threaded into the sleeve 66 and provided with a head 72 engaging a slot 73 in the slide 52. The position of the slide 52 and the shoe 50 may be adj usted relative to the steadyrest shoe 51 by turning the screw 70.

To permit the steadyrest shoes to swing clear of the work when it is desired to remove the rest to an inoperative position, it is necessary that the steadyrest shoes, and articularly the lower one, be moved throng a considerable distance from their operating positions. 'l'o accomplish this, the slot 58 is elongated and so vmay permit the pivot pin 57 to drop from an operating position and there- .by provide ample clearance so that the shoe 51 will notstrike the work 75 when the steadyrest 20 is swung to an inoperative position. A. cam 76 on the upper end of the clamping member 44 is arranged to Contact with a surface 7 7 on the bottom of the lever 56. When the clamping member' 44 is swung to unlock the rest the cam surface 76 withdraws from engagement with the surface 77 of the lever 56 and permits the pivot pin 57 to drop from the top of the elongated slot 58 to the bottom, as shown in full lines in Fig. 1. rlhis movement is aided by the spring 78 fastened to the top of the. lever 56 and pressing against an under surface 79 of the frame 20.

A positioning movement of the steadyrest shoes 50 and 51 may be accomplished by progear segment 64 and rack 65 to produce a positioning movement of the shoes and 51. lVhen the pivot stud 57 is dropped within the elongated slot 58, the downward movej ment of the pivot pin rocks lever 56 about collar 81 as a fulcrumand the gear segment 63 moves upwardly and in turn rocks the gear segment 61 of the bell crank level' 60 in an upward direction, thereby transmitting an outward movement to the rack 65 and sleeve 66 and so moving the steadyrest shoe 50 away from the surface of the work.

To move the steadyrest shoes into operative contact with the work a lever mechanism is provided, including the sleeve 82 which is pivotally connected to the stud 83 on the steadyrest 20. This sleeve carries a cam follower which contacts with a cam face 85 on the upper surface of the lever 56. A collar-81 and spring 87 surround the sleeve and exert an upward pressure on the lever 56 to hold the level rigidly in contact with the follower v80. It will be readily seen (Fig. 4) that when the lever is moved from the position indicated in full lines into a position indicated in dotted lines, the cam follower 80 rides over the surface of the cam 85 and inasmuch as the follower 80 is fixed. the movement of the cam is transmitted to rock the lever 56 about its pivot 57 and thereby swing the'steadyrest shoe 51 upward into contact with the work. The rocking movement of the lever 56 about the pivot 57 causes a downward movement of the gear segment 63 which ein turn moves the gear segment 61 in the same direction to rock the bell crank lever 60 and move the rack 65, sleeve 66 and the steadyrest shoe 50 toward the work into operative contact therewith. This movement of the shoes 50 and 51 is simultaneous so that they are both brought into engagement with the work at substantially the same time.

To permit adjustment of the shoes 50 and 51, the upper end of the sleeve 82 is provided with a screw thread-ed portion engaging the threads of an adjusting sleeve 91, so that the operator by turning the adjusting sleeve 91, the lower end of which contacts with the caln follower 80, moves the cam follower either downward or upward and rocks the lever 56 about the stud 57 and produces the desired adjustment of the shoes 50 and 5l relative tothe work. As illustrated in the drawings (Fig. 2) the slide 52 supporting the shoe 50 is provided with an elongated slot 94 which permits the sleeve 82 within adjusting sleeve 90 to swing through the desired movement to control the steadyrest shoes. By means of the screw 70 the steadyrestshoe 50 may be adjusted independently of shoe 51 to bring itinto the proper relation with the shoe 51 when setting up the machine. After these shoes have once been adjusted for a given size of work, the swinging of the sleeve 82 toward and from the grinding wheel moves the steadyrest shoes 50 and 51 simultaneously into or out of operative contact with the work 75.

Gauge'ng mechanism In order that the work may be readily gauged and that the gauging operation may be controlled, a gauging device is provided and supported by an arm fixed at its lower end to the projecting hub 101 of the steadyrest 20 (Fig. 3). The upper end of the arm 100 is provided with a vertically extending stud 102 which in turn supports the gauging apparatus 103. Any ofthe well known gauging devices, such as a standard Pratt gauge, may be utilized for this operation. This galigginounted on the arm 102, comprises the anvil 104 having a three point contact with the surface of the work, formed by the adjustable screws 105 and 106 and a plunger 107 which is slidably mounted within the sleeve 108. The plunger 107 projects from the upper end of the sleeve 108 and contacts with the plunger of a suitable dial indicator 109. The sleeve 108 is connected by a bracket 110 and by a stud 111 to a link 112 which in turn is connected -through a pivot 113 to a link 114. The other end -of link 114 is fastened to an adjustable support 115 mounted on the end of a rod 116 which is adjustably supported for vertical movement on the rod 102.

In order that the gauge may be readily moved to and from its operating position in contact with the work, it may be operatively connected to the lever controlling the posi-' tioning of the steadyrest shoes, a rod 120 is connected at one end to a collar 121 surrounding and fixed to the sleeve 108. The other end of the rod 120 is slidably supported by a sleeve 122 which is in turn pivotally supported by a second sleeve 123 surrounding and fixed to the sleeve 124 on a rod 125 which is slidably mounted within the sleeve 82. It will thus bevseen that any swinging. movement of the sleeve 82 toward and from the `work is permitted without transmitting any movement to the rod 120. In order that the rod 120 may be moved in timed relation with theswinging movement of the sleeve 82, a pair of adjustable collars 126 and 127 are mounted on the rod 120. By adjusting the positions of the collars, the steadyrest shoes and gauging head 104 may be brought into operative contact with the work at the same time. The gauge moves from the dotted position of Fig. 1 to the position in Fig. 2. 'If desired, the collars 126 and 127 may be adjusted so that there is a lost motion connec Coolant fn-id suppl/y The grindingr wheel is sup lied with a coolant fluid which may he o tained from any suitable source of supply, such as a pump in the base of the machine. The fluid passes through a pipe 130, a butterfly valve 131, the pipe 132` flexible pipe 133 through the spout 134 and to the grinding wheel 15. In order that the valve 131 may be readily controlled from the operators position in front of the machine, an operating handle or knob 136 is mounted on the front end of a rod 137. The other end of the rod 137 is pivotally connected to a lever 138 which is in turn connected to the valve stem to operate the valve 131 and serves to move it as desired.

ln order that the swinging movement of `the steadyrest 20 toand from an operating position may also operate to turn on or shut off the supply of coolant fluid, a suitable connection is provided between the swinging arm 21 and the rod 137. As illustrated in Fig. 1. this comprises an arm 140 lixedly mounted on the outer end of the stud 22 so that it is rigid and swings with the arm 21. This arm 140 is provided with a pin 141 adapted to engage a slot 142 in the member 143. rlhe member 143 is slidably mounted on the rod 137 so as to provide a lost motion connection between the' valve operating rod and the arm 21 which controls the swinging movement ofthe steadyrest. A pair of adjustable collars 1441 and 145 are mounted on` the rod 137 to permit varying the amount of lost motion and also to time the operation of the valve with the swinging movement of the steadyrest, so that the supply of coolant *liuid may be Aturned on and shut od at the desired time. The operator also has a manual control of the valve 131, since he may at any time raise the knob 136 and rod 137 to disengagc the groove 142 and the pin 141 so that the valve may be operated manually without disturbing the position of the steadyrest.

Grinding] 'wheel fear] mechanism The grinding wheel slide 14 may be fed toward and from the work by any suitable mechanism. such as a fluid pressure device, as illustrated diagrannnatically in Fig. 1 of the drawings. This mechanism may comprise a cylinder 150 supported on the base of the machine and having a piston 151 slidably mounted therein. The piston is Suipported on one end of a piston rod 152, t e other end of which is ixed to the wheel slide by a bracket 153. It will thus be seen that admission of luid to either end of the cylinder will move the piston one way' or the other and transmit a corresponding movement to the Wheel slide. A suitable valve mechanism, such as the balanced piston valve 155, is providedto control the supply of iiuid under pressure entering and leavingthe cylinder 150. This valve is provided with pistons156 and 157 mounted on the vvalve stem 158 and is controlled by a lever 159 pivotall mounted on the stud 160 on the front of tlie machine base. Fluid under pressure may be supplied from any suitable source, such as a gear pump in the base, through a pipe 161 and into the valve chamber 162 between the valve istons 156 and 157. Fluid entering the cham and enters the port 164 of the cylinder 150 forcing the piston 151 toward the left, as viewed in Fi 1, to feed the grindin wheel into the wor to size the same. A er the sizingoperation has been completed, the operator may swing lever 159 into position 159a '(Fig. 2) to throw the valve into the neutral position shown in Fig. 1. When the valve pistons are located at 156e and 157e the pipes 163 and 164 are closed thereby preventlng any movement of the grinding wheel slide (see Fig. 1). The valve operating lever 159 may be thrown directly to a position 159?) an so move the valve pistons to a position as indicated by dotted lines 156?) and 1575 r 162 passes through a pipe 163 tel in Fig. 2, thereby admitting duid under presl sure tothe pipe 164 which connects with the port 165 in the cylinder 150 to move the piston 151 toward the right as viewed in Fig. 1 and cause the grinding wheel to move rearwardly out of contact with the work.

Steadg/rest contro? ,for stopping wheel feed Provision is made for inter-connecting the device which moves the steadyrest shoes and the gauging device with the valve which controis the wheel feed mechanism. For this purpose, a suitable knob 167 is provided on the upper end of the rod 125 which is supported by the sleeve 82. This rod extends downwardly through the sleeve 90 and the pivot pin 83 and carries at its lower end a shoe 168 which contacts with a spring pressed shoe 169 slidably mounted in the projection 170 of the steadyrest 20. The lower end of this spring pressed shoe is provided with a cont-act member 171 which contacts with an adjustable stud 17 2 on the end of the arm 173 of a bell crank lever. rThe other arm 17 4 of the bell crank lever is connected to the valve stem 158 by a pivot pin 175. 1t will be readily seen from this construction that a, downward movement of the knob 167 will force the 'shoes 168 andl 169 and the contact member to the table 12.

171 downwardly, thereby rocking the bell crank lever arms 173 and 174 to moveV the valve stem'158 toward the right as viewed in Fig. 2. The stud 172 may be adjusted so that the downward movement of the knob 167 may move the valve pistons into the neu- Table traverse mechanism The work supporting table 12 may be reciprocated or traversed by the mechanism illustrated diagrammatically in Fig. 3. This mechanism may comprise a cylinder 180 supported on the machine base, and a piston 181 slidably mounted therein. A piston rod 182 is connected at one end to the piston 181 and at the other end to a` bracket 183 fixed The'admission of fluid under pressure to the cylinder 180 is controlled by a balanced piston valve 184 having the pistons 185 and 186 tixedly mounted on the valve stem 187. The outer end of the valve stem 187 is pivotally connected by a stud 188 to a control lever 189. Fluid is admitted to the valve 184 from any suitable source of supply through the pipe 190 entering the valve chamber 191 and passing through the pipe 192 or 193 to port 194 and 195 respectively in the cylinder 180. When the lever 189 is shifted to a position 189e (Fig. 3), the pistons 185 and 186 are moved to positions 185a and 186e permitting the fluide to ilow from valve chamber 191 through the pipe 192 and the port 194 to move the table toward the left, as viewed in Fig. 3. Or the operator may move the lever 189 toward the right into position 1892, thereby moving the valve pistons into positions 1851 and 1861) to permit.

iuid to How from the valve chamber through pipe 193, and port 195 to move the piston 181 and table 12 toward the right, as viewed in Fig. 3. )Vhen iuid is forced through pipe 192 and port 194 to move the table toward the left (Fig. 3), iiuid is exhausted from the other end of the cylinder through port 195, pipe 193, a valve chamber 196 and exhaust pipe 197 into the reservoir. Similarly, when fluid is forced through pipe 193 and port 195 to move the table toward the right (Fig. 3),

fluid is exhausted from the other end of the cylinder through port 194, pipe 192, valve chamber 198 and exhaust pipe 199 to the reservoir.

Interlock for trave-rse mechanism In a grinding machine of the doublehead typesuch as used in crankshaft grinding,

tion. This may be accomplished by means of a mechanism provided to lock the traverse control valve 184 in a neutral position, so that the Huid cannot be admitted to move the table in either direction while the steadyrest is in an operating position. For this purpose a lever 200 is pivotally mounted on a stud 201 on the 'machine base and connected by a pin 202 to a link 203.which is inturnconnected by a pin 204 to the control lever 189. The upper end of the lever 200 is provided with a yoked portion 205 adapted to be engaged by a spring pressed plunger 206 which is supported in the base of the machine. The member 171 on the lower end of the spring pressed shoe 169 is provided with a projecting portion 207 adapted to engage the outer end of the spring pressed plunger 206. When the steadyrest is locked to the table, as shown in Fig. 2, the projection 207 contacts with the outer end of the plunger 206 and moves it into 'engagement with the yoked portion 205, thereby locking the lever 200, link 203, lever 189 and the valve 184 in a neutral position to prevent longitudinal movement of the table during the grinding operation. Similarly when the steadyrest 20 is moved from an operative to an inoperative position, the projection 207 swings out of contact with the spring pressed plunger 206 and thereby permits the plunger to Withdraw from enga rement with the yoke 205 ,t0 unlock the valve 184: and permit the table to be traversed to any desired position.

0 pemtz'on The operation of this mechanism will be readily apparent from the foregoing disclosure. The operator first mounts the work piece, such as a crankshaft 75, in position on the work supporting table 12. The operator then manipulates the lever 189 to traverse the table 12 longitudinally of the base 11 to position the crankpin or object to be ground in proper relation with the grinding wheel and then shifts the lever 189 to a neutral position stopping the movement of the table.

Movement of the lever 189 to the left, for example, traverses the table to the left by admitting fluid through pipe 192 to the right end of cylinder 18() (Fig. 3). When the work has thus been moved into proper position in front of the wheel, then the operator grasps the handle 41 and pulls the steadyrest 2() downwardly against the pressure of spring 30 from the full line position shown in Fig. 1 and into contact with the table 1'2, and a continued movement of the handle 41 clamps the rest 20 rigidly on the table and also moves the steadyrest shoes 50 and 51 into a position adjacent to but not in contact with the surface of the work 75.

`When the hand lever 41 is tirst pulled downwardly. the arm 21 swings about its pivot 22, and the steadyrest supported on-the arm 23 is located by the springs 39 and 40 in approximately the dotted line position shown in Fig. 1. rl`hen the operator pushes lever 41 and rocks it towards the grinding wheel about pivot 42, thereby pushing the link 47 and rocking the clamping shoe 44 about pivot 45 intoengagement with the undercut surface of table 12 (Fig. 2), thereby locking the -table between the lug 43 and the shoe Before the lever 41 has been rocked to clamp the steadyrest to the table, the lever 56 carrying the steadyrest shoe 51 is so located that the pin 57 on the lever is held Vby the spring 7 8 in the bottom of the slot 58, as shown in full lilies in Fig. l, and the cam surface 76 of the shoe 44 contacts with the cam surface 77 in the position shown in Fig. 5. rl`he lever operated by handle 167 is also in the vertical position shown in Fig. 4. When the shoe 44 is moved int-o a clamping posit-ion by means of lever 41 the cam surface 76 slides along cam surface.77 towards the shoe 51. These two cam surfaces are so shaped that as the shoe moves, the lever 56 and shoe 51 will be lifted and pin 57 moved upwardly in the slot 58 to the position shown in Fig. 4 and the dotted position shown in Fig. 1. Simultaneous with the 'lifting movement of shoe 51, the shoe 50 is moved forward by the gear segment connections. At this time the collar 81 and the n cam follower 80 serve as a ulcrum about which the lever 56 rocks. This rocking movement swings the gear segment lever 60. which is loosely pivoted on the same pin 42 that carries the handle 41,'and pushes the rack 65 which is adjustably connected through screw 70 to move the shoe 50.

1When the swinging arm 21 is moved down. the arm 140 is rocked and so pulls the rod 137 and opens .the valve 131, thus causing the water to iow to the work. if the operator desires, he may lift the rod 1357 by means of handle 136 and prevent its movement by the steadyrest support. so that hc may control the valve manually.

- Then the steadyrest was swung into operativeposition in Contact with the table 12. the projection 207 forced the spring pressed plunger 206 into engagement with the yoked member 205. thereby locking the valve 184 in a neutral position so as to prevent longitudinal movement of the table .1Q during the grinding operation.

The work rotation is then started and by moving the lever 159 into the position illustrated in full lilies in Fig. 2, the operator the work. Movement of the knob 167 towards the grinding wheel swings the sleeve 82 about the pivot 83 and slides the cam follower 80 over the cam 85 and swings the lever 56 about the cam surface 76 of the shoe 44 as a fulcru1n 'and raises the shoe 51 gradually into contact with the work. The shoe is simultaneously brought into contact with the Work by the downward movement of the gear segment 63 on the lever 56. Forward movement of the knob 167 pushes the collar 123 into contact with the stop 127 and so moves the gauge 109 into registering contact with the work, simultaneously with the positioning of the steadyrest shoes. y

The grinding operation proceeds until the dial indicator indicates that the work has been reduced to the required size. The operator then moves the knob 16? and rod 125 downwardly to push contact member 171 and rock the bell crank 173 and put 'the valve 155 in such a position as to stop the feeding movement of the grinding wheel and permit a die-out or sparI ing out of the Wheel to finish grind the work, and, if themechanism is so adjusted, to move the valve 155 thereafter into a reverse position and thereby remove the grinding Wheel rapidly rom operative engagement with the work. After this has been completed, the operator, still grasping the knob 167, swings the knob toward the left, as viewed in Fig. 2, and thereby swings the gauging device and the steadyrest shoes away from the surface ot the work. He then grasps the handle 41 and swings it outwardly to nnclamp 'the steadyrest and then move it away from the work into an inoperative position shown in full lines in F ig. 1. This movement of the rest operates to automatically shut ott the coolant fluid and the operator is then readv to manipulate the lever 189 to traverse the table and bring `the next crankpin into alignment with the grinding wheel. This cycle of operations may be repeated to grind successive portions of the work.

, Having thus' described my invention, what l claim as new and desire to secure by Letters Patent 1s:

1. A grinding machine comprising a base,

a work support and a grinding Wheel thereon, a. steadvrest including a frame having a work steadying shoe thereon, a supporting member movably mounted on the base and carrying said steadyrest arranged for moving the steadyrest frame bodily to and from an operative position, and means independent ot' said member to secure the steadyrest trame rigidly to the base in an operative position for supporting the work.

i2. A grinding machine comprising a base, a work support and a grinding Wheel thereon. a steadyrest including a trame having a pair of adjustable work steadying shoes thereon, means on the frame for adjusting the two shoes relative to each other, a supporting member movably mounted on the base and carrying said steadyrest arranged for moving the latter bodil \Y to and from an operative position and means to secure ,the steadyrest frame rigidly to the base in an operative position for supporting the Work.

3. A grinding machine comprising a base, a rotatable work support and a rotatable grinding Wheel thereon to grind the Work, a steadyrest including a frame having two independently adjustable Work steadying shoes, means for adjusting the same relative to the frame, means to clamp said rest in an operative position in fixed relation With said base, means including a movable member which is operatively connected between said frame and base and is so arranged that the rest may be readily moved to and from an operative position where the shoes are out of contact with the Work, and means indeendent of the shoe adjusting means for movmg the shoes into contact with the work.

4. A grinding'machine comprising a base, a Work support and a grinding Wheel thereon, a guard surrounding said Wheel, an arm pivotally supported on said guard, a steadyrest including a frame and adjustable Work steadying shoes, means on said frame for adjusting the positions of the shoes, and means including connections between said arm and frame which are so arrangedthat the steadyrest may be moved bodily to and held in an Operative position for grinding or moved to an inoperative position after grinding.

5. A grinding machine comprising a base,

a work support and a grinding Wheel thereon, a steadyrest including a frame having an adjustable Work steadying shoe thereon,

a supporting arm movably mounted on the base and carrying said steadyrest Which is arranged or moving the latter to and from an operative position, means to secure the stcadyrest frame rigidly to the base in an operative position, and means to counterbalance the steadyrest and arm so as to render the parts easily movable.

6. A grinding machine comprising a base, a. longitudinally movable rotatable Work supporting table thereon, a rotatable grinding wheel thereon to grind the work. a steadyrest having independently adjustable Work steadying shoes, said steadyrest haviner a supporting surface mating with a sur ace on said table, a clamping device to clamp said rest to said surface, an arm pivotally connected to said steadyrest, and pivotal connections between the other end of said arm and the base which are arranged so that the rest maybe swung bodily to an inoperative position or returned to a position Where said surfaces mate.

7. A grinding machine comprising a base, a work support and a grinding wheel thereon, a steadyrest including a frame having an adjustable work steadying shoe, a gauging device to engage and measure the work during grinding, and a. supporting member movably mounted on the base which carries the steadyrest and gauging device and serves tor moving thembodily to and from an operative position.

8. A Work steadying and gauging apparatus for grinding machines comprising a gauging device having a work contacting member, a steadyrest having a pair ot adjustable work steadying shoes, means to clamp the steadyrest on the machine` and means to simultaneously move the work steadying shoes and said work contacting member into or ont of operative contact with the surface of the work.

9. A work steadying and gauging appara'- tus for grinding machines comprising a gauging device having a work contacting member, a steadyrest having a pair of adjustable work steadying shoes, and means including a single lever to simultaneously move the Work steadying shoes and said worlgcontacting member into or out of operativc'contact with the surface of the Work.

10. A Work steadying and gauging apparatus for grinding machines comprising a steadyrest having a Work steadying shoe. a movable gauging device having a work contacting member, means to support both the steadyrest and gauging device for simultaneous movement to and from a position adjacent to but out of contact with the surface of the Work, means to clamp the steadyrest in an operative position and a second means Ato simultaneously move the work steadying shoe and the Work contacting member into operative contact with the Work.

1l. A grinding machine having a base, a work supporting table thereon, a grinding wheel rotatably mounted to grind the work, a steadyrest including a trame having an adjustable Work steadying shoe, a movable sup-l relative to the Work, and means including a clamping mechanism to simultaneously clamp the steadyrest rigidly in engagement with said table and to move the steadyrest shoe relative to the frame and position if adjacent to the piece of work'to be ground. v

12.'A grinding machine having a base, a work supporting table thereon, a wheel slide movable transversely of said base, a ygrinding wheel rotatably mounted on said slide, a steadyrest having movable shoes to steady the work during the grinding operation, a pivotal/ly mounted support for the steadyrest arranged to permit the rest to be swung to and from an` operative position relative to the work, a manually operable clamping mechanism to secure the steadyrest to the table, and means cooperating therewith to move the shoes into position adjacent to the work when the steadyrest is clamped to the table.

13. A grinding machine having a base, a work support and a grinding wheel thereon, a steadyrest including a frame having an adjustable shoe to steady the work, means for adjusting the shoe, a movably mounted support .for the steadyrest arranged to permit the rest to be moved bodily to and from a position where the shoe is located close to but out of contact with the work, means to clamp the steadyrest frame in an operative position, and manually operable means to move the previously adjusted shoe relative to the frame intocontact with the work.

14. A grinding machine comprising a base, a work support and a grinding wheel thereon, a steadyrest including a frame having two separately adjustable shoes, means to adjust them independently of each other, a movably mounted support for the steadyrest arranged to permit the rest to be moved bodily to and from a position where the shoes are located close to but out of Contact with the work, means to clamp the steadyrest frame in an operative position, and a single manually operable device connected to each of the shoes for moving them simultaneously into engagement with the work after the rest has been clamped in place.

15. A grinding machine comprising a base, a work support and a grinding wheel thereon, a steadyrest including a frame having a shoe engageable with the work at a point adjacent to the line of contact of the wheel and work, a movably mounted support for the steadyrest arranged to permit the rest to be moved bodily to and from' an operative position relative to the work, clamping means to lock the steadyrest frame in an operative position, means cooperating with said clampin g means to raise said shoe to a position adj acent to but out of contact with the work, and a manually operable means to adjustably position the shoe in Contact with the work.

16. A grinding machine comprising a base, a work support and a grinding wheel thereon,

a bodily movable steadyrest having a frame and two separately adjustable shoes thereon, one of which is engageable with the work at a point adjacent to the line of Contact4 of the Wheel and work when in an operative position, means for separately adjusting the shoes relative to the frame, a supporting member for the steadyrest which is movable to position the rest in or away from an operative position, means to clamp the steadyrest rigidly relative to the base, and means for so positioning the shoes relative to the frame that the steadyrest may be bodily to raise said shoe to position it near the line of contact between the wheel and work but out of contact therewith, and a single device to simultaneously move both shoes into contact with the work.

18. A grinding machine comprising a work support, a grinding wheel rotatably mounted to grind thework, a conduit having a valve therein to supply coolant fluid to the grinding wheel, a steadyrest for the work, a support for the steadyrest movably mounted' on the `base for moving the steadyrest to and from an operative position, and connections 4 between said movably mounted support and valve to shut said valve when the steadyrest moves out of an operative position.

19. A grinding machine comprising a base, -a work support thereon, a grinding wheel rotatably mounted to grind the work, a conduit having a valve therein for supplying fluid to the grinding wheel, a steadyrest for the work, a support for the steadyrest pivotally mounted on the base and arranged to swing the steadyrest from an operative posi- -tion relative to the work to an inoperative position above the work, and connections between said pivotally mounted support and the valve to close the valve when the steadyrest is removed from an operative position.

20. A grinding machine having a base, a work table traversable longitudinally thereof, a grinding wheel mounted to grind the work, meansto traverse the table, a

l operated upon moving the steadyrest into opi erative position to automatically lock the traverse mechanism and thereby prevent longitudinal movement of the table during the grinding operation.

21. A grinding machine having a base, a.

' vwork table traversable longitudinally thereof, a fluid pressure mechanism including a control valve to traverse said table longitudinally of the base, a steadyrest, a movable support for the steadyrest arranged and permitted to be moved into and out of operative relation With the Work, and connections between said valve and movable support for the steadyrest arranged to close the valve and prevent movement of the Work table While the steadyrest is in position adjacent to the work.

22. A grinding machine having a base, a Work table traversable longitudinally thereof, a grinding wheel mounted to grind the work, means to traverse the table, a gauge for the Work, a support for the gauge permitting the latter to be moved into and out of operative relation with the work, and means connecting the gauge and support with the table traversing mechanism to prevent movement of the latter when'the gauge is in operative relation Withthe Work.

23. A grinding machine having a base, -a Work table traversable longitudinally thereof, a fluid pressure mechanism including a control valve to traverse said table, agrinding Wheel to grind the Work, a gauge'for the Work, a support for the gauge permitting the latter to be moved into and out of operative relation with the Work, and means connecting the gauge and support with the uid pressure mechanism to lock said valve in a neutral position and prevents movement of the Work table while the gauge is in an operative position.

24. A grinding machine comprising a base, af-Work table thereon, aD Wheel Slide movable transversely of the base, mechanism to feedL the Wheel slide toward and from the work,

a steadyrest, a support for the steadyrest permitting it to be moved to and from an operative position relativeto the work, and a memberion 'said rest movable to position the steadyrest shoe in or out of an operative relation with the work and-movable to stop the movement of the Wheel slide.

25. A grinding machine having a base, a work table thereorna wheel slide movable transversely of the base, mechanism to feed the grinding wheel toward and from the Work, a'steadyrest having a. shoe movable to an operative position relative to the Work during. grinding, means including a control member on said rest to move the steadyrest shoe into and out of operative position, and connections operated by the control member tostop the grinding wheel feed mechanism.

26. A grinding machine having a base. a work table thereon, a Wheel slide movable transversely of the base, Huid pressure mechanism, including a valve, to feed the grinding Wheel toward and from the Work,l a steadyrest having a shoe movable to an operative relation with the Work during grinding, a member on said rest movablein'one direction to move the steadyrest shoe into and out of operative relation with the Work and in another direction to close the valve and sto the inteed of the Wheel.

2 A grinding machine having a base, a work table thereon, a Wheel slide movable transversely of the base, a rotatable grinding Wheel on said slide, a iiuid pressure mechanism, including a valve, to move the slide to feed the grinding wheel into the Work, a steadyrest having a shoe movableinto operative relation with the Work, a-gauging device mounted on said steadyrest, and a manually operablelever on. said steadyrest movable in one direction to simultaneously move the steadyrest shoe and gauging device into or out of operative relation with the surface of the Work and movable in a second direction to close the valve and stop the infeed of the grinding Wheel and thereby prevent further grinding action when -thegauge indicates that Work has been reduced to the required s1ze.

28. A grinding machine.l having a basea Work table thereon, a Wheel slide movable transversely of the base, a grinding wheel on said slide, mechanism to move the slide` to feed' the Wheel into and out vof contact with the Work, a steadyrest, a support for the steadyrest movable to position it in or out of operative relation with the Work, and means rendered operative by positioning the steadyrest near the Work for controlling the Wheel slide mechanism. y

29. A grinding machine having a base, a Work table slidable longitudinally thereof, mechanism to traverse said table, a wheel slide movable transversely of the base, a grinding. Wheel on the slide, mechanism to move the slide to feed the Wheel into and out of contact With the Work, a steadyrest, a support for the steadyrest movable to position it in or o utof operative relation with the Work, means operated automatically upon swinging the rest into operative position to lock the table traverse mechanism, ,and means rendered operative by positioning the steadyrest near the Work-for controlling the wheel slide mechanism. I

30. A- grindin machine comprising a base, a work table slidable Ilongitudinallythereof, fluid pressure mechanism, including a control valve, to traverse said table,a grinding Wheel slide movable transversely of thebase, fluid pressure mechanism to movethe grinding Wheel toward and from the v'vork,`- a steadyrest, a support for the rest movable 'to position it in or out of operative relation with the Work, means rendering the control valve for the table traversing mechanism inoperative When the steadyrest is in operative osition relative tothe work, and means renuid supply when the calipering device is gered operative by positioning the steadyrest moved 1ntoV operative engagement with the near the work for controlling the valve of the work.

wheel slide -traversing mechanism. Signed at Worcester, Massachusetts, this 5 31. A grinding machine having a base, a 29th day of December, 1928.

Work table thereon,`a wheel slide movable HERBERT A; SILV'EN. transversely ofY the base, a grinding wheel on l said slide, mechanism to move the slide to feed the wheel into and out of contact with the work, a steadyrest, a support for the steadyrest movable to postion it in or out of operative relation with the work, and means rendered operative by positioning the steadyrest near the work for controlling the wheel slide mechanism, said last mentioned means also serving for moving the steadyrest shoe into and out of contact with the work.

32. A grinding machine having a base, a work table slidable longitudinally thereof, mechanism to traverse said table, a grinding wheel slide movable transversely of the base,

a fluid pressure mechanism, including a control valve, to move the slide to feed the grind- .Y ing wheel into or ont of'contact with the work, a steadyrest having a movable shoe, a.v support forjthe steadyrest movable to' position itin or out of operative relation with the work, means operated automatically upon swinging the rest into operative position tolock the table traverse mechanism, and a manually operable lever cooperating with said parts whichis movable in one direction to move the steadyrest shoe into operative contact with the work and in another direction to close the control valve and stop the infeed of the grinding wheel, 33.- A grinding machine comprising a base, a rotatable grinding wheel and a wol-lrV support which are movable relatively towards and from each other, a coolant fluid system including a valve to convey coolant fluid to Y the grinding wheel and work, a caliperi'ng device engaging the work 'during grinding, a support for the calipering device movably mounted on thebase for moving it towards and from an operative position, and means responsive to movement of the calipering device to actuate said valve and shut of! the coolant fluid supply when the de-f vice isremoved from contact with the work. Y 34. A grinding machine comprising a bm, a rotatable grinding wheel and a work sup-V port which are movable relatively towards and from each other, a coolant fluid system including a valve to convey coolant Huid to the wheel and work, a calipering device engagingthe-work during grinding, a support for sa'id device pivotally mounted on .the base and arranged'to swingit from an inoperative position above the work into operative t-therewith, and means responsivetoni ofthedevice 55 tcactuatesaidvllvemdtumonthecoolmt 

